. >> it's a combined mass and speed, the momentum, the energy within the crowd that creates the combined force. it's not how much i can push against the wall. it's everybody pushing against me. whenever steel and stone meets flesh and bone, there can only be one winner. >> like much of the stadium, the wall is in disrepair from years of neglect. the force of the fans against the already weakened structure creates a perfect storm. liverpool fan chris rolland is doctoring the stadium. >> as we were making our way in, we actually heard the wall break. and we saw lots of -- what appeared to be italian supporters -- clambering over the wall. charging down the banks toward us. that's what they were trying to do to escape the trouble. >> frantic italian fans are tramping each other as they try to escape danger. >> we hear that there's two dead, four dead, ten dead, 16 dead. we're going, oh my god. and of course, people would be getting more and more worried if they had family there. it's happened to them. where are they? couldn't give them a call. >> while paramedics tepid to be injured that ha